The Free Software Foundation - They developed some key tools (e.g. gcc) used by free software projects and promote free software.

OpenBSD - While I don't run any OpenBSD systems, I use openssh which they maintain. And they do a lot to get hardware documentation and redistibutable firmware which ends up being used in Linux systems, which I do use.

Dan Bernstein - In particular I have financially supported his legal defense fund for his case against the U.S. Government over whether or not encryption research can be published.